US Made HK UMP45 Receivers?

Has anyone on here made a US made HK UMP45 semi- receiver for their gun? I have looked at photos of the UMP and USC receivers and think that it would be an easy undertaking with a mill and a block of 7075 T6, especially for the advanced builder's who make artwork on here.

I know that HDPS thought about doing them, and another company started to then fell though. I would like to have a pistol and then SBR it when I can move to another state that allows them.